Advisory Details

April 22nd, 2021

Schneider Electric C-Bus Toolkit ACCESS SAVE Directory Traversal Remote Code Execution Vulnerability

ZDI-21-447
ZDI-CAN-12586

CVE ID CVE-2021-22717
CVSS SCORE 8.8, (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
AFFECTED VENDORS Schneider Electric
AFFECTED PRODUCTS C-Bus Toolkit
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Schneider Electric C-Bus Toolkit. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed.

The specific flaw exists within the processing of commands sent to the C-Gate 2 Service. The issue results from the lack of proper validation of a user-supplied path prior to using it in file operations. An attacker can leverage this vulnerability to execute code in the context of SYSTEM.

ADDITIONAL DETAILS Schneider Electric has issued an update to correct this vulnerability. More details can be found at:
http://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-103-01 https://us-cert.cisa.gov/ics/advisories/icsa-21-105-01
DISCLOSURE TIMELINE
  • 2021-02-03 - Vulnerability reported to vendor
  • 2021-04-22 - Coordinated public release of advisory
CREDIT rgod
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